graves



6 Sheets-Sheet l.

Patanted Dec. 6, I898.

E. GRAVES.

(Application filed Aug. 25, 1897.)

HYDRAULIC RIVETING MACHINE.

No. 6l5,547.

(No Mpdel.)

N. UNRN No. 6l5,547. I Patented Dec. 6, 1898. E. GRAVES.

HYDRAULIC RIVETING MACHINE.

(Applicntion filed Aug. 25, 1897,) (No Model.) 6 Sheets-Sheet?- w WW v r 111: news ny mum-um; mimnwou. o; c;

Patented Dec. 6, I898. E. GRAVES.

HYDRAULIC RIVETING MACHINE.

(Application filed Aug. 25, 1897.)

6 Sheets-Sheet 3.

No. 6l5,5.47.

(No Model.)

No. 615,547., Patented Dec. 6,- I898. E. GRAVES.

HYDRAULIC BIVETING MACHINE.

(Application filed Aug. 25, 1897.) (No Model.) .6 sheets-Sheet 4.

' Fleas.

23 z v Z3 W aw/ 0 No. 6|5,547. Patented Dec. 6, 1898-.

E. GRAVES. HYDRAULIC RIVETING MACHINE.

(Application filed Aug. 26, 18937.) (.No Modal.) 6 Sheets-Sheet 5.

No. 6I5,547.

Patented Dec. 6, I898. E. GRAVES.

HYDRAULIC RIVETING MACHINE.

(Application filed Aug. 25, 1897.)

6 Sheets-Sheet 6.

(No Model.)

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. UNITED STATES PATENT OFFICE.

ERWIN GRAVES, OF CAMDEN, NEW JERSEY, ASSIGNOR TO THE CAMDEN IRON \VORKS, OF SAME PLACE.

HYDRAULIC RlVETlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 615,547, dated December 6, 1898.

Application filed August 25, 1897. Serial No. 649,466. (No model.)

To aZZ whom it may concern:

Be it known that I, ERWIN GRAVES, a citizen of the United States, and a resident of Camden, New Jersey, have invented certain Improvements in Hydraulic Riveting -Machines, of which the following is a specification.

My invention relates to riveting or punching machines operated by water, air, or other fluid under pressure, the object of my invention being to provide means for efiecting the squaring or leveling of two or more superposed plates which are being riveted together or are having openings punched therein, such squaring or leveling of the plates being brought about by the action of a preliminary pressing device which acts in advance of the riveting die or punch and serves not only to press the plates firmly together, but also to press them squarely upon the counter-die, so that the faces of the plates will be brought into position parallel with the face of said countendie, or in the case of a portable riveter or punch to square the machine over the work and hold it rigidly in the proper position, thus preventing any deformation of the rivet.

In the accompanying drawings, Figure l is a side view of sufficient of a riveting or punching machine to illustrate my invention. Fig. 2 is a top or plan View of the same. Fig. 2 is an enlarged view of the valve-chests and valves of the machine. Fig. 3 is an enlarged view, partly in elevation and partly in trans verse section, on the line at at, Fig. 1; and Figs. 4, 5 and 6 are views illustrating certain modifications of the invention.

I have in the present instance illustrated my invention as appliedto a hydraulic riveting-machine of the jaw type, the upper projecting jaw 1 having the cylinder 2 for the reception of the piston 3, whose rod 4 carries the upper riveting-die, the lower projecting jaw 5 of the frame carrying the lower die 6. It should be understood, however, that my invention is not limited to this particular type of machine; but it may be applied to any ordinary form of riveting-machine using air, water, or other fluid under pressure as the motive power, or it may be applied to machines for punching as well as for riveting.

In Fig. 1, 7 represents the pipe through which air, water, or other fluid under pressure is conveyed to the machine, said pipe having three branches 9, 10, and 11,the branch 9 leading to the inlet-branch 12 of a valvechest 13, which has a distributing branch 14. and an exhaust branch 15 and contains a valve of any suitable character whereby said branch 14 may be placed in communication either with the branch 12 or with the branch 15 of the chest, said valve having a projecting stem 16.

The branch pipe 10 leads to the inlet branch 17 of a smaller valve-chest 18, having a dis tributing branch 19 and an exhaust branch 20, this chest likewise containing a valve similar to but of less area than the valve of the chest 13 and like it having a projecting stem 16*. The valve-chests 13 and 18 occupy reverse positions, so that downward movement of the valve inthe chest 18 is required in order to put the inlet branch 17 of the same into communication with the distributing branch 19, upward movement of the valve cutting off the flow from the branch 17 to the branch 19 and putting the latter into communication with the exhaust branch 20, the movement of the valve in the chest 13 being the reverse of this.

Both of the valve-stems l6 and 16 are connected to a single operating-lever 21, so that by the operation of this lever the valves of both of the chests 13 and 18 can be operated, the movement of the valve in the chest 18 al ways preceding that of the valve in the chest 13 because of the less resistance to such movement due to the smaller area of said valve in the chest 18. In moving the handle in either direction, therefore, the connection between said handle and the valve-stem 16 serves as a fulcrum until the further movement of the valve-stem 16 is arrested by reason of its valve reaching the limit of its movement in the valve-chest 18,whereupon the connection between the lever 21 and the stem 16 be comes the fulcrum, and further movement of said lever effects movement of the valve in the chest 13.

The distributing branch 14E of the valvechest 13 communicates througha pipe 22 with the upper end of the cylinder 2, above the pis ton 3 therein, and the distributing branch 19 and 27 which passes through a suitable stuffin g-box at the lower end of the cylinder, these piston-rods 27 being connected to the squaring device 29, which in the present instance consists of a short tube surrounding the upper riveting-die 30, which is carried by and projects from the lower end of the piston-rod 4, as shown in Fig. 3. The tube 29 slightly underlaps the piston-rod 4 and has lateral flanges 31, which are secured to the lower ends of the piston-rods 27.

The branch 11 of the pipe 7 is forked and supplies motive fluid to the lower ends of the cylinders 25,so that constant pressure is maintained beneath the pistons 26, tending to raise tne same and with them the squaring device 29, piston-rod 4, and piston 3, as shown in Figs. 1 and 3, this being the normal or inoperative condition of themachine, and the valves in both of the chests 13 either occupying an intermediate or inoperative position, so as to cut off the distributing branch of each chest from both the inlet or exhaust branches, or occupying such position as to open communication between the distributing branch of each chest and the exhaust branch.

When it is desired to operate the machine, downward pressure is exerted upon the outer end of the lever 21, so as to first move downward the valve in the chest 18 and permit of the flow of motive fluid through the pipes 23 and 24 into the upper ends of the cylinders 25, so as to cause the descent of the pistons 26 therein,owing to the greater area presented to pressure by the tops of said pistons than by the under sides of the same. This causes the descent of the squaring device 29 and the pressing of the same firmly upon the plates resting upon the lower die 6, and this is im mediately followed by the descent of the piston-3, piston-rod 4, and upper riveting-die 30, owing to the fact that the upward movement ofthe valve in the chest 13 immediately follows the downward movement of the valve in'the chest 18 as downward pressure continues to be exerted upon the operating-lever 21. After the operation has been completed the parts are restored to the former position by raising the lever 21, so as to effect the lifting of the valve in the chest 18, followed by the descent of the valve in the chest 13, thus opening to the exhaust first the upper ends of the cylinders 25 and then the upper end of the cylinder 2, the rise of the squaring device causing the simultaneous rise of the pisment of said squaring device with the lower end of said piston-rod 4.

While I prefer in all cases to use the duplex cylinder for operating the squaring device, a single-cylinder construction may, if desired, be employed without departing from the main features of my invention, and in Figs. 4 and 5 I have illustrated two different forms of such single-cylinder-operatin g mechanism for the squaring device.

In the constructionshown in Fig. 4 the piston-rod 4 is at one side of the piston 3 and the cylinder 25 is beneath the overhanging portion of said piston, the piston-rod 27 being connected to a stem 32, projecting upwardly from the squaring device, at one side of the latter, and guided in a downward continuation of said cylinder 25.

In the construction shown in Fig. 5 the piston-rod 4 is also at one side of the piston 3 and the cylinder 25 is beneath the overhanging portion of said piston, but the pistonrod 27 projects upwardly from the piston 26 instead of downwardly and is connected to a lateral flange 33 on a sleeve 34. which surrounds the piston-rod 4 and carries at its lower end a squaring device 29 In this case the arrangement of the pipes for supplying motive fluid to-the cylinder 25 will be the reverse of that shown in Fig. 1, the constantpressure pipe 11 communicating with the upper end of the cylinder 25 and the pipe 24 communicating with the lower end of the same, so that the squaring device will be lowered onvexhausting pressure from the lower end of the cylinder and will be raised on admitting pressure thereto, the valve-chests 13 and 18 being likewise rearranged to permit of this action.

In Fig. 6 I have shown a modified construction of valve-operating device in which the lever 21 is hung to a fixed pivot 35 and the valve-stems 16 and 16 are connected to a cross-lever 36 and which is hung to the inner end of the operating-lever 21 by means of a link 37. In this case the connection between the cross-lever 36 and the stem 16 will serve as the fulcrum until the valve in the chest 18 reaches the limit of its movement in either direction, whereupon the connection between the lever 36 and stem 16 becomes the fulcrum and further movement of said lever is imparted to the valve-stem 16.

Having thus described my invention, I claim and desire to secure by Letters Pat= cut- 1. The combination in a riveting or punch in g machine, of a main cylinder having a piston with rod carrying ariveting tool or punch, a squaring device, a supplementary cylinder having piston with rod connected to said squaring device, a valve chest with valve for controlling the flow of motive fluid to and from the main cylinder, a valve-chest with valve of less diameter than the first for con= ton-rod 4 and'piston 3, owing to the engagetrolnng the flow 01: motive fluid to and from to and from the main cylinder, a second valvethe first for controlling the flow of motive fluid to and from the supplementary cylinder, and a single operating-lever engaging directly with the stems of said valves,whereby it fulcrums first upon one and then upon the other of said stems.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ERWIN GRAVES.

Witnesses WM. J. HAMLIN,

chest having a valve of smaller diameter than WALTER O. RULoW. 

